Note 7 - Investment Securities (Tables)
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9 Months Ended |
Sep. 30, 2021 |
Notes Tables |
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Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
| | September 30, 2021 | |
| | | | | | Gross | | | Gross | | | | | |
| | Amortized | | | Unrealized | | | Unrealized | | | | | |
| | Cost | | | Gains | | | Losses | | | Fair Value | |
| | (In thousands) | |
Securities Available-for-Sale | | | | | | | | | | | | | | | | |
U.S. treasury securities | | $ | 40,206 | | | $ | 5 | | | $ | — | | | $ | 40,211 | |
U.S. government agency entities | | | 89,823 | | | | 1,255 | | | | 135 | | | | 90,943 | |
Mortgage-backed securities | | | 798,905 | | | | 12,490 | | | | 6,328 | | | | 805,067 | |
Collateralized mortgage obligations | | | 9,792 | | | | — | | | | 231 | | | | 9,561 | |
Corporate debt securities | | | 134,348 | | | | 514 | | | | 1,428 | | | | 133,434 | |
Total | | $ | 1,073,074 | | | $ | 14,264 | | | $ | 8,122 | | | $ | 1,079,216 | |
| | December 31, 2020 | |
| | | | | | Gross | | | Gross | | | | | |
| | Amortized | | | Unrealized | | | Unrealized | | | | | |
| | Cost | | | Gains | | | Losses | | | Fair Value | |
| | (In thousands) | |
Securities Available-for-Sale | | | | | | | | | | | | | | | | |
U.S. treasury securities | | $ | 80,948 | | | $ | 6 | | | $ | 6 | | | $ | 80,948 | |
U.S. government agency entities | | | 99,944 | | | | 441 | | | | 546 | | | | 99,839 | |
Mortgage-backed securities | | | 709,709 | | | | 17,965 | | | | 606 | | | | 727,068 | |
Collateralized mortgage obligations | | | 10,358 | | | | — | | | | 34 | | | | 10,324 | |
Corporate debt securities | | | 118,271 | | | | 367 | | | | 267 | | | | 118,371 | |
Total | | $ | 1,019,230 | | | $ | 18,779 | | | $ | 1,459 | | | $ | 1,036,550 | |
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Investments Classified by Contractual Maturity Date [Table Text Block] |
| | September 30, 2021 | |
| | Securities Available-For-Sale | |
| | Amortized Cost | | | Fair Value | |
| | (In thousands) | |
| | | | | | | | |
Due in one year or less | | $ | 45,215 | | | $ | 45,234 | |
Due after one year through five years | | | 117,088 | | | | 115,615 | |
Due after five years through ten years | | | 149,474 | | | | 153,657 | |
Due after ten years | | | 761,297 | | | | 764,710 | |
Total | | $ | 1,073,074 | | | $ | 1,079,216 | |
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Schedule of Unrealized Loss on Investments [Table Text Block] |
| | September 30, 2021 | |
| | Less than 12 Months | | | 12 Months or Longer | | | Total | |
| | | | | | Gross | | | | | | | Gross | | | | | | | Gross | |
| | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| | (In thousands) | |
Securities Available-for-Sale | | | | | | | | | | | | | | | | | | | | | | | | |
U.S. government agency entities | | $ | — | | | $ | — | | | $ | 2,403 | | | $ | 135 | | | $ | 2,403 | | | $ | 135 | |
Mortgage-backed securities | | | 399,470 | | | | 5,632 | | | | 7,038 | | | | 696 | | | | 406,508 | | | | 6,328 | |
Collateralized mortgage obligations | | | 9,418 | | | | 219 | | | | 144 | | | | 12 | | | | 9,562 | | | | 231 | |
Corporate debt securities | | | 91,870 | | | | 1,144 | | | | 19,716 | | | | 284 | | | | 111,586 | | | | 1,428 | |
Total | | $ | 500,758 | | | $ | 6,995 | | | $ | 29,301 | | | $ | 1,127 | | | $ | 530,059 | | | $ | 8,122 | |
| | December 31, 2020 | |
| | Less than 12 Months | | | 12 Months or Longer | | | Total | |
| | | | | | Gross | | | | | | | Gross | | | | | | | Gross | |
| | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | |
| | Value | | | Losses | | | Value | | | Losses | | | Value | | | Losses | |
| | (In thousands) | |
Securities Available-for-Sale | | | | | | | | | | | | | | | | | | | | | | | | |
U.S. treasury securities | | $ | 40,952 | | | $ | 6 | | | $ | — | | | $ | — | | | $ | 40,952 | | | $ | 6 | |
U.S. government agency entities | | | 26,390 | | | | 102 | | | | 40,009 | | | | 444 | | | | 66,399 | | | | 546 | |
Mortgage-backed securities | | | 1,694 | | | | 23 | | | | 8,093 | | | | 583 | | | | 9,787 | | | | 606 | |
Collateralized mortgage obligations | | | 10,131 | | | | 25 | | | | 193 | | | | 9 | | | | 10,324 | | | | 34 | |
Corporate debt securities | | | 58,405 | | | | 267 | | | | — | | | | — | | | | 58,405 | | | | 267 | |
Total | | $ | 137,572 | | | $ | 423 | | | $ | 48,295 | | | $ | 1,036 | | | $ | 185,867 | | | $ | 1,459 | |
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